What is brightness adaptation?

• A. Changing the eye‚Äö√Ñ√∂‚àö√ë‚àö¬•s overall sensitivity
• B. Changing the eye‚Äö√Ñ√∂‚àö√ë‚àö¬•s imaging ability
• C. Adjusting the focal length
• D. Transition from scotopic to photopic vision